> The variation in productivity between programmers is somewhere from 1 to 10 to 1 to 100
I agree with your sentiment, but I think you're missing something important: it is possible (and, unfortunately, quite realistic) for a low-level programmer to be "negatively productive". For difficult problems, it may simply not be possible for someone without the required skill and experience to find a solution. Even for easy problems, though, it's possible that the solution found by a weak developer will in the long run cost more than the benefits it offers, for example, because they reduced the overall design quality of the system and later a stronger developer has to spend their valuable time fixing the design to clear the technical debt.
You're very correct and I added a note to that effect apparently while you were composing your reply. And your point about the easy problems is really important to highlight (and wasn't one I was thinking about).
I agree with your sentiment, but I think you're missing something important: it is possible (and, unfortunately, quite realistic) for a low-level programmer to be "negatively productive". For difficult problems, it may simply not be possible for someone without the required skill and experience to find a solution. Even for easy problems, though, it's possible that the solution found by a weak developer will in the long run cost more than the benefits it offers, for example, because they reduced the overall design quality of the system and later a stronger developer has to spend their valuable time fixing the design to clear the technical debt.